High pressure pump



Sept. 13, 1932. J. L. MAULDIN HIGH PRESSURE PUMP Filed June 16, 1930 Inventor JZLMauZaZZn M By Allomey Patented Sept. 13, 1932 PATENT. OFFICE JOHN LEE MAULDIN, OF PETTU S, TEXAS 7 HIGH rnnssunn PUMP Application filed June 1e,

This invention relates to improvements in high pressure pumps, and the objects of the present invention are, first to enabledrillers of wells to blow plugs out of plugged 5 bits; second to test casing (pipe) and ascertain if there be a leak or leaks therein; third, to test the seat of casing (pipe) and ascertain if there be an escape of water after cement plugs have been drilled out; fourth to obtain returns (circulation of mud) on stuck casing or drill stem (pipe) when returns are not obtainable by low pressure pumps; fifth, to plug a well or kill a well; sixth to pull casing (pipe) and seventh, to serve other high pressure needs.

Other objects and advantages of the invention will become apparent during a study of the followin description, taken in connection with the accompanying drawing, wherein:

Figure 1 is an elevational view of my improved pressure pump,

Figure 2 is a longitudinal sectional View therethrough, V

With reference more in detail to the drawing, it will be seen that my improved pressure pump comprises an open ended cylinder 5 normally closed at one end through the medium of a nipple 6, which nipple is also closed at its upper end as at 8. The nipple is secured to the lower end of the cylinder 5 through the medium of an internally threaded collar 9 threadedly connected to said lower end. of the cylinder 5 and the upper end portion of the nipple 6. The upper end of the cylinder 5 is normally closed through the medium of a suitable cap 9 provided with an annular flange or skirt internally threaded for threaded engagement with the upper end of the cylinder as at 10.

Mounted for reciprocation within the cylinder 5 is a piston 11, the same at its up- 0 per end being reduced as at 12. The reduced portion 12 forms on the upper portion of the piston an annular shoulder and together follower plate 14 retains about the upper reduced portion of the piston 11 a suitable packing 13. The piston rod is designated by the reference character 15, and at dium of a suitable supporting. pipe26'thread 1930." ser al No; 461,445.

its lower end the said piston rod is provided with a relatively thick externally threaded portion threaded within the piston 11'; and at its lower end has a suitable nut 17 threaded thereon. A lock nut 18- is threaded on the upperend portion of the threaded end 16 of said piston rod for hearing. against the plate 14: to retain the latter in position; A nipple 19 has its upper closed end threaded in the lower-end of the cap 9 axially of the cap. and the piston rod 15, extends through the nipple 19 and the cap 9 to project beyond the upper'end of the cap through asuitable stuffingfbox arrangement formed in the cap 9 as at 21. The nipple 19 is suitably threaded in theccap 9 as at 20. Convoluted about the piston rod 15 is a coil spring 22, one end of which bears" against jthe' lock nut 18, and the upper end of which bears against the upper close'dend of. the nipple 19 for, normally urging-the piston 1 1 down wardly or toward the'lower end of casing 5' The upper extended end: of the piston rod; 15 has suitably secured thereto a bail'23 normally engaged by a hook24 suspended from a suitable travellingfblock -'desi'gnatezl generally by the referencecharacter'25. The reference character G designates a pressure gauge having communication with the interior ofthe nipple 6 through themeed at one end in thewalls of the nipple; Thejnipple is alsofprovided externally" thereof with a suitable pressure release Valve 27.- c j The cylinder'5 adjacent the top and bottom thereof is also provided with upper and lower pet cocks 28 and28 respectively. Leading into the upper end of. the cylinder 5 is a suitable, intakevpipe 29' having Lar ranged therein a check v'a]ve 30; Leading from the upper endp rtionof the cylinder5 to the nipple 6 atopposite sides of the cylinder 5 and nipple 6 are ,by- 1 passes designated generally by the reference 95 characters 31 and 32 respectivelyk EachYof the said by-passes include a pipe 33 leading from one side of the nipp le 6 and coupled at its free end through the mediumof an elbow 345 to ariserpipe' 35. Arranged in me 1 one side of the nipple with one side of the the riser pipe 35 is a gate valve 36; Above the gate valve 36 and also arranged in the riser 35 is a check valve 37.

The upper end of the riser 35 is suitably coupled to a pipe section 39 through the medium of a union 38. The pipe section 39 in turn is coupled to a pipe 41 leading into the upper end of the cylinder 5 through the medium of a suitable elbow 40.

The operationof my improved pressure pump is as follows: The pump is to be fitted in a casing or drill stem Within a well.

Water is then pumped through the intake pipe 29 and check valve 30 into the cylinder 5. Power from an engine (not shown) is to be applied through the travelling block to move the iston 11 upwardly of the cylinder 5 against t e action of the spring 22. As the saidpiston ascends, with the accumulation of water above it, the water will be forced through the by-passes 31, 32, into the nipple 6,, thus filling said nipple and adding to the contents of the well casing and thus develop ing enough pressure to accomplish the object in View Whether that object he to blow the plugs out of plugged bits; to test the well casing for ascertaining WllGthGIOI' not there be a leak 'or leaks therein, or to test the seat of the casing and ascertain if there be an escape of water after cement plugs have been drilled out. Again it'may be to obtain returns :(circulation of mud) on stuck casing or drill stem when returns are not obtainable by low pressure pumps or again it may be the provision, of pressure to plug 5 a well or kill a well, or perhaps to pull the Wellcasing or lastly for any other such pur-v poses for which pressure in the well casing is desirable. In the operation of the device water forced into the nipple'8 isprevented '3 from turning through the by-passes 31 and 32 to the casing by the, check valve arranged in each of the said by-passes. I

Obviously the pressure resulting is registered on the pressure gauge. Any excess pressure may be released through the pressure release valve 27 of the nipple. Also air within the cylinder 5 may be released through thepet cocks 28 and 28 7 Even though I have herein shown and described the preferred embodiment of my invention, it is to be understood that the same issusceptible to'changes fully comprehended by the spirit of the invention as herein dei, scribed, and the scope of the appended claim.

Having thus described my invention, what I claim as new isi In apressure pump of the class described, a cylinder opened'at its lower end, a nipplev having a closed end normally closing the opened end of said cylinder, means coupling one :end of thenipple with an adjacent end of the cylinder,osaid nipple being provided with an outlet, a valved conduit connecting cylinder adjacent the upper end of the cylinder, a second valved conduit connecting the opposite side of the nipple with the corresponding side of the cylinder adjacent the upper end of the cylinder, a piston mounted for reciprocation in said cylinder, spring means normally urging the piston toward the lower end of the cylinder, a rod for said piston extending outwardly through the top of the cylinder, said rod at its free end a JO NiL E AU INe 

